What are the alpha-blockers and the 5-alpha reductase inhibitors? Alpha-blockers are a category of medicines used for the remedy of BPH. Alpha receptors are positioned inside the bladder and the prostate and so they modulate tone. Read more: http://tipsdiscover.com/health/what-are-the-alpha-blockers-and-the-5-alpha-reductase-inhibitors/#ixzz3XmsY5po0